Damage Localization of Cable-Supported Bridges Using Modal Frequency Data and Probabilistic Neural Network

Table 2

Comparison between computed and measured modal frequencies of Ting Kau Bridge (TKB).

Mode type and order	Computed (Hz)	Measured (Hz)	Difference (%)
Predominantly vertical mode
1st	0.1632	0.1618	0.86
2nd	0.3002	0.3145	−4.55
3rd	0.3439	0.3527	−2.50
4th	0.3701	0.3727	−0.70
Predominantly lateral mode
1st	0.1635	—	—
2nd	0.2236	0.2264	−1.24
3rd	0.2425	0.2518	−3.69
4th	0.2477	0.2591	−4.40
Predominantly torsional mode
1st	0.4587	0.4427	3.61
2nd	0.5137	0.4809	6.82
3rd	0.5201	0.5155	0.89
4th	0.5655	0.5345	5.80